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So, how much does one actually cost?

For a basic Igloo (8 wall panels, without furniture) prices start from AUD $22,560 (current as of Dec. 2014) - http://www.icewall.com.au/about/faqs/

And what's the actual cost to make one?

That's a number set by the licensed manufacturer, which I'm not party to. Sorry.

Or about $17,236 in American dollars